Commutation Failure analysis in single- and multi-infeed HVDC systems

Wei, Zhanhong; Liu, Juhua; Fang, Wanliang; Hou, Junxian; Xiang, Zhengrong

doi:10.1109/appeec.2016.7779887

Cited by 15 publications

(18 citation statements)

References 12 publications

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“…Simulation-based assessment methods are common approaches to assess CF. References [3,4] use methods based on electromechanical transient simulation to assess CF. Although their computational efficiency can be ensured, the assessment results are not accurate enough due to shortcomings of the quasi-steady-state HVDC model.…”

Section: Introductionmentioning

confidence: 99%

Assessment of commutation failure in HVDC systems considering spatial-temporal discreteness of AC system faults

Yang

Cai

et al. 2018

J. Mod. Power Syst. Clean Energy

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This paper presents a novel commutation failure (CF) assessment method considering the influences of voltage magnitude drop, phase shift, and spatial-temporal discreteness of AC system faults. The commutating voltage-time area is employed to analyze the spatial-temporal discreteness of AC system faults causing CF in high-voltage direct current systems, and the influences of fault position and fault time on CF are revealed. Based on this, a novel CF criterion is proposed, further considering the influence of voltage phase shift and the spatial-temporal discreteness. Then this research develops a new CF assessment method, which does not rely on electromagnetic transient simulations. A real case from the China Southern Power Grid is used to verify the practicability of the proposed method by comparing with simulation results obtained using PSCAD/EMTDC.

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Section: Introductionmentioning

confidence: 99%

Assessment of commutation failure in HVDC systems considering spatial-temporal discreteness of AC system faults

Yang

Cai

et al. 2018

J. Mod. Power Syst. Clean Energy

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“…System parameters are as follows [22] At 0.6 s, the current order is changed from 1.0 kA to 0.5 kA. Simulation results are shown in Figure 11.…”

Section: Single-bridge Six-pulse Hvdc Systemmentioning

confidence: 99%

Research on the Inductance/Capacitance Switch Model for an LCC-HVDC Converter in an AC/DC Hybrid Grid

Zheng

Tai

et al. 2018

Energies

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Abstract:In order to improve the simulation speed of the AC/DC hybrid grid, the inductance/capacitance (L/C) switch model for line-commutated converter of high-voltage direct current (LCC-HVDC) is presented in this study. The time domain modeling method is used to analyze the circuit of L/C switch model for the six-pulse system in LCC-HVDC in a switching period. A parameter setting method of L/C switch model is proposed considering the transient response, the steady state performance, switching losses and simulation error of the switch. The inductance/capacitance (L/C) switch model for LCC-HVDC has the advantage of keeping the admittance matrix unchanged regardless of the change of switching state, which improves the simulation efficiency. Finally, the validity of the parameter setting method is verified. Compared with the test results of PSCAD/EMTDC, the accuracy of the proposed LCC-HVDC simulation model is proved. The model is suitable for real-time or offline simulation of AC/DC hybrid grid.

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“…In terms of CF, the increase of DC current and the decreased extinction angle may lead to CF due to the thyristor turn-off characteristics [2], and this CF can result in a shutdown of the LCC HVDC system and voltage instability on the AC-side [1]. Several indices for risk evaluation have been developed and reported to assess the stability of AC grids in the planning stage of LCC HVDC systems [9]- [16]. Besides, cascaded CF concerns were investigated for the large-scale multi-infeed HVDC systems [13].…”

Section: Introductionmentioning

confidence: 99%

“…A coordinated operation is developed among multiple HVDC lines called multi-infeed systems to improve the transmission capacity and system stability [9]- [12], [15], [16], [31], [32]. Recently, several utilities have carried out preliminary technical investigations to upgrade coseffectively upgrade and exploit existing LCC HVDC systems, by tapping a new MMC station onto the LCC HVDC system, which is called a hybrid MTDC system [33]- [39].…”

Section: Introductionmentioning

confidence: 99%

DC Power Control Strategy of MMC for Commutation Failure Prevention in Hybrid Multi-Terminal HVDC System

et al. 2020

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This paper presents a control strategy for a modular multilevel converter (MMC) to prevent commutation failure of a line-commutated converter (LCC), forming a three-terminal hybrid HVDC transmission system, where one LCC sending end is connected to the large generation and two receiving ends (LCC inverter and MMC) are located near the load center. This configuration, one of the potential options, has been proposed to strengthen Korea electric power transmission system through the optimized use of existing assets and rights-of-way, extremely challenging to secure. The MMC power control strategy has been developed to regulate the AC voltage and the extinction angle of the LCC inverter. This indirect yet effective active and reactive power control of the LCC inverter terminal helps prevent the commutation failure (CF) of the LCC in emergency and maximize the benefits of the costly planning option. By establishing a theoretical foundation for this power control problem and relationship among the control parameters, we quantify the active power reference for MMC to secure the desired LCC extinction angle. A coordinated strategy has been developed for the AC filter, the on-load tap changer of a transformer, along with the MMC control to lower the risk of CF and its catastrophic impact on the whole power system. The validity and performance of the proposed control methods are demonstrated for the real Korea electric power planning cases using a real-time power system simulator. INDEX TERMS Commutation failure, extinction angle, gamma-kick, hybrid multi-terminal HVDC system, weak AC system.

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Commutation Failure analysis in single- and multi-infeed HVDC systems

Cited by 15 publications

References 12 publications

Assessment of commutation failure in HVDC systems considering spatial-temporal discreteness of AC system faults

Assessment of commutation failure in HVDC systems considering spatial-temporal discreteness of AC system faults

Research on the Inductance/Capacitance Switch Model for an LCC-HVDC Converter in an AC/DC Hybrid Grid

DC Power Control Strategy of MMC for Commutation Failure Prevention in Hybrid Multi-Terminal HVDC System

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